Experiencing some CORS issue in `v6.0.0` while using storybook composition feature.

Experiencing some CORS issue in v6.0.0 while using storybook composition feature. I’m adding a ref for a local storybook:

refs: {
    react_components: { 
      title: "React Components", 
      url: "http://localhost:9010"
    },

The local storybook works well on port 9010, but not loaded from the combined storybook

dev-tools output:

node - v14.5.0
react - v16.13.1

In addition, I would like to know if there is an option to give a path of the storybook build directory as a url of ref?

_Originally posted by @rannyeli in https://github.com/storybookjs/storybook/issues/9311#issuecomment-671426067_

[ndelangen]

PR is open, with a fix

[TechieQian]

I built storybook static and served the assets from a cors enabled python http server.

I was able to get the right response headers (Access-Control-Allow-Origin: *).

But I was still getting a cors issue for stories.json. I actually don’t see any stories.json being generated. Is this a different issue?